Slope toe steel sheet pile supporting structure of deep foundation pit large-slope
By setting up a backfill stone powder zone and a plain soil zone at the toe of the deep foundation pit's large slope to reinforce the support structure, and by using cranes and vibratory hammers, the problem of difficult sheet pile extraction was solved, achieving efficient and safe sheet pile extraction, and reducing construction costs and time.
Patent Information
- Application Number
- CN202520496668.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-20
AI Technical Summary
The sheet pile support structure at the toe of a deep foundation pit with a large slope presents a problem of difficulty in removing the sheet piles during construction, especially in confined spaces and at the bottom of the deep pit where effective operation is not possible, which affects the construction progress and increases costs.
The support structure was reinforced by backfilling with stone powder and plain soil. The sheet piles were removed by using a crane, pile driver and extractor, and a vibratory hammer with a hydraulic high-pressure pipe. The vibration was used to break the soil cohesion to overcome the resistance to pile extraction. The sheet piles were then removed by combining the lifting force of the crane.
It improves the efficiency of sheet pile extraction, reduces construction period and cost, ensures construction safety, and avoids safety hazards caused by the inability to extract sheet piles.
Smart Images
Figure CN223880355U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of building construction, and specifically relates to a deep foundation pit large batter slope foot steel sheet pile supporting structure. BACKGROUND
[0002] Deep foundation pit large batter slope jet anchor supporting is a common supporting mode for building engineering foundation pit excavation, and some errors exist in the construction of foundation pit batter, such as the fact that the slope foot construction is not in place and the batter slope is not accurate, which leads to the fact that the foundation bottom plate may exist into the foundation pit supporting slope bottom, and the outer wall wall side pile cap excavation destroys the pit bottom slope supporting, in order to ensure that the pile cap excavation pit bottom slope supporting is safe and reliable, the slope bottom needs to be punched to set a steel sheet pile before the outer wall side pile cap excavation, so as to avoid the slope bottom collapse.
[0003] In view of the special situation that the deep foundation pit large excavation batter supporting slope foot and the pile cap structure extend into the slope foot, direct excavation of the slope foot will affect the safety of the support, and the steel sheet pile support and removal is a more economical method. In terms of large batter, the steel sheet pile can be punched into the pit bottom, and after the completion of the foundation structure construction, the basement outer wall and the pit bottom slope form a narrow effective space, and the steel sheet pile removal is difficult due to the influence of the pit bottom foundation structure, the pile pulling machine has no effective working space, and how to remove the steel sheet pile is a construction problem. The traditional treatment method can change the size of the small pile cap structure, or temporarily support the pit bottom with wooden piles, reduce the size of the structure pile cap, which may affect the size of the foundation, but the supporting depth is limited, the steel sheet pile is punched into the pit bottom slope foot, the supporting depth is increased, the size of the pile cap is not affected, but the technical problem of steel sheet pile removal still needs to be considered. The traditional way of removing the steel sheet pile is to use the pile pulling machine, and after the foundation bottom plate is poured and the strength meets the requirements, the pile pulling machine walks on the bottom plate, but this method will affect the construction period of the structure, is easy to cause the phenomenon of worker's work, and the steel sheet pile removal is faced with the problem of narrow space around, and the pile pulling is difficult due to the deep pit bottom. If the steel sheet pile is not removed, the investment cost will be increased. Therefore, a deep foundation pit large batter slope foot steel sheet pile supporting structure which is stable in structure and convenient to remove the steel sheet pile is needed. UTILITY MODEL CONTENTS
[0004] The utility model aims at providing a deep foundation pit large batter slope foot steel sheet pile supporting structure which is stable in structure and convenient to remove the steel sheet pile, so as to prevent the slope foot collapse, solve the technical problem that the steel sheet pile is difficult to remove due to the fact that the pile pulling machine cannot reach the pit bottom, and ensure the safety of the pit bottom slope foot excavation.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0006] The deep foundation pit large slope toe steel sheet pile supporting structure comprises a plurality of steel sheet piles arranged vertically downward on the foundation pit slope, the steel sheet piles are arranged side by side in front and back, the upper end of the steel sheet pile extends out of the foundation pit slope, a foundation bottom plate is arranged at the right side of the steel sheet pile, a bearing platform is arranged at the lower part of the foundation bottom plate, a first cushion layer is arranged at the bottom of the foundation pit, a waterproof protective layer is arranged at the top of the foundation bottom plate, a basement outer wall is connected to the upper end of the foundation bottom plate, the waterproof protective layer is arranged at the left side of the basement outer wall, a backfilling stone powder area and a bottom plate brick membrane are arranged between the left end of the foundation bottom plate and the right side surface of the steel sheet pile, a backfilling soil area and a first bearing platform brick membrane are arranged between the left end of the bearing platform and the steel sheet pile.
[0007] The gap between the backfilling soil area and the backfilling stone powder area is filled with a second cushion layer, and the right end of the second cushion layer is provided with a second bearing platform brick membrane.
[0008] A water stop steel plate is arranged in the basement outer wall.
[0009] The upper end of the backfilling stone powder area is provided with a concrete capping layer.
[0010] The backfilling stone powder area is located at the left side of the bottom plate brick membrane, and the bottom plate brick membrane is arranged on the left end surface of the foundation bottom plate.
[0011] The backfilling soil area is located at the left side of the first bearing platform brick membrane, and the first bearing platform brick membrane is arranged on the left end of the bearing platform.
[0012] The right side of the steel sheet pile is provided with a foundation bottom plate, the lower part of the foundation bottom plate is provided with a bearing platform, the bottom of the bearing platform is provided with a first cushion layer, the first cushion layer is arranged at the bottom of the foundation pit, the top of the foundation bottom plate is provided with a waterproof protective layer, the upper end of the foundation bottom plate is connected to a basement outer wall, the waterproof protective layer is arranged at the left side of the basement outer wall, a backfilling stone powder area and a bottom plate brick membrane are arranged between the left end of the foundation bottom plate and the right side surface of the steel sheet pile, a backfilling soil area and a first bearing platform brick membrane are arranged between the left end of the bearing platform and the steel sheet pile, the backfilling stone powder area and the backfilling soil area arranged between the foundation bottom plate and the bearing platform and the steel sheet pile can effectively reinforce the supporting structure, the left end of the foundation bottom plate and the two ends of the bearing platform are provided with corresponding bottom plate brick membranes and bearing platform brick membranes, which further improves the firmness of the supporting structure, greatly guarantees the safety of construction, and is beneficial to the pulling out of the steel sheet pile. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is a structure schematic view of the steel sheet pile positioning and steel sheet pile setting of the utility model.
[0014] Figure 2 It is Figure 1 An enlarged view of A part in figure 2.
[0015] Figure 3 It is a structure schematic view of the brick membrane and foundation bottom plate construction of the utility model.
[0016] Figure 4 is Figure 3 is an enlarged view of B part in figure 1.
[0017] Figure 5 is a structural schematic diagram of backfilling stone powder and pouring C15 plain concrete of the utility model.
[0018] Figure 6 is Figure 5 is an enlarged view of C part in figure 1.
[0019] Figure 7 is a structural schematic diagram of removing steel sheet pile of the utility model.
[0020] Figure 8 is Figure 7 is an enlarged view of D part in figure 1. DETAILED DESCRIPTION
[0021] As Figures 1-8 shown, the deep foundation pit large slope toe steel sheet pile supporting structure, including a plurality of steel sheet piles 1 vertically downward arranged on the foundation pit slope 2, a plurality of steel sheet piles 1 are arranged side by side, the upper end of the steel sheet pile 1 is out of the foundation pit slope 2, the right side of the steel sheet pile 1 is provided with a foundation slab 3, the lower part of the foundation slab 3 is provided with a bearing platform 4, the bottom of the bearing platform 4 is provided with a first cushion layer 5, the first cushion layer 5 is arranged at the bottom of the foundation pit, the top of the foundation slab 3 is provided with a waterproof protective layer 6, the upper end of the foundation slab 3 is connected with the basement outer wall 7, the waterproof protective layer 6 is arranged at the left side of the basement outer wall 7, the left end of the foundation slab 3 and the right side of the steel sheet pile 1 are provided with a backfilling stone powder area 8 and a foundation slab brick membrane 9, the backfilling stone powder area 8 is located at the left side of the foundation slab brick membrane 9, the foundation slab brick membrane 9 is arranged on the left end face of the foundation slab 3, the left end of the bearing platform 4 and the steel sheet pile 1 are provided with a backfilling soil area 10 and a first bearing platform brick membrane 11, the first bearing platform brick membrane 11 is arranged on the left end of the bearing platform 4. The gap between the backfilling soil area 10 and the backfilling stone powder area 8 is filled with a second cushion layer 16, the right end of the bearing platform 4 is provided with a second bearing platform brick membrane 17, the bottom end of the first bearing platform brick membrane 11 and the second bearing platform brick membrane 17 are arranged on the first cushion layer 5. The basement outer wall 7 is provided with a water stop steel plate 18, the upper end of the backfilling stone powder area 8 is provided with a concrete coping layer 19. The backfilling stone powder area 8 and the backfilling soil area 10 arranged between the foundation slab 3 and the bearing platform 4 and the steel sheet pile 1 can effectively reinforce the supporting structure, and the corresponding foundation slab brick membrane 9 and the first bearing platform brick membrane 11 and the second bearing platform brick membrane 17 are arranged at the left end of the foundation slab 3 and the two ends of the bearing platform 4, which further improves the firmness of the supporting structure, greatly ensures the safety of construction, and is beneficial to the removal of the steel sheet pile 1.
[0022] The steel sheet pile support structure of the present application is first positioned and laid out at the large slope bottom during the actual construction, that is, the steel sheet pile 1 side line to be set is measured and laid out; specifically, the base pit bottom side line and the brick formwork outer side line of the pile cap 4 are matched, the range of the pile cap 4 and the bottom plate brick formwork into the base pit bottom is found out, the steel sheet pile 1 side line is designed in depth according to the range, and the steel sheet pile 1 side line to be set is measured and laid out according to the deepening drawing. Then the steel sheet pile 1 is set at the pit bottom, and the steel sheet pile 1 is set according to the measured and laid out steel sheet pile 1 side line; specifically, the steel sheet pile 1 is set according to the laid out side line, the steel sheet pile 1 is sunk by vibration method, the surface layer of the anchor is broken by the air pick before the pile is sunk, the exposed soil nails, anchor rods and steel mesh are cut off, and the whole steel mesh surface layer is prevented from being cracked during the process of setting the steel sheet pile 1. Then the brick formwork and the foundation bottom plate 3 structure construction is carried out; specifically, the brick formwork construction is carried out first, during the brick formwork construction, the measurement and laying out and the pile cap 4 excavation are carried out first, then the pile cutting and the cushion pouring are carried out, and finally the brick formwork is built, during the brick formwork building, the inner side of the brick formwork is plastered and the outer side of the brick formwork is backfilled in layers, the backfilling height is the bottom mark height of the foundation bottom plate 3 cushion, after the brick formwork building is completed, the foundation bottom plate 3 structure construction is started, during the specific construction, the basement bottom plate waterproof construction is carried out first, then the bottom plate steel bar binding is carried out, and finally the bottom plate concrete is poured, the brick formwork and the foundation bottom plate 3 structure construction is completed. Then the outer wall reentrant corner water drainage and the water drainage protection layer are constructed and the stone powder is backfilled and the C15 plain concrete is poured; specifically, after the bottom plate concrete pouring is completed, the outer wall reentrant corner waterproof and waterproof protection layer 6 are constructed in time, the stone powder is backfilled in the groove formed between the foundation bottom plate 3 and the steel sheet pile 1, and then the 100mm thick C15 plain concrete is poured to form a concrete compression layer, on the one hand, the concrete compression layer can reduce the situation of the steel sheet pile 1 pulling out with soil in the later stage, and on the other hand, the concrete compression layer can be used as the foundation of the outer frame vertical rod of the basement and as the drainage ditch around the foundation pit. Then the basement structure is constructed and the waterproof and protection layer building of the basement outer wall 7 is carried out, after the building is completed, the basement outer frame is removed, at this time, the steel sheet pile 1 support structure construction is completed to form the steel sheet pile 1 support structure; specifically, after the backfilling and hardening process in the groove formed between the foundation bottom plate 3 and the steel sheet pile 1 is completed, the basement double-row floor type footwork outer frame is erected, the basement structure is constructed, after the basement structure construction is completed, the waterproof layer construction of the basement outer wall 7 and the waterproof protection layer 6 building are completed in time, and the basement outer frame is removed after the building is completed. The operation conditions for the steel sheet pile 1 pulling out are provided as soon as possible, the steel sheet pile 1 rental cost is reduced, and the construction cost is reduced.
[0023] Finally, the steel sheet pile 1 is removed, and the construction of the deep foundation pit large slope toe support structure is completed. Due to the narrow space of the basement and the deep depth of the foundation pit, the equipment cannot be used from the bottom (or top) to remove the steel sheet pile 1 using the conventional construction method. Therefore, a crane is used to cooperate with the pile pulling machine 12 and the vibration hammer 15 connected with the lengthened hydraulic high-pressure oil pipe to remove the pile: the forced vibration generated by the vibration hammer 15 disturbs the soil and destroys the cohesion of the soil around the steel sheet pile 1 to overcome the pile pulling resistance, and the pile is removed by relying on the additional lifting force of the crane.
[0024] When the steel sheet pile 1 is removed, the following steps are taken:
[0025] ① Mechanical equipment in place: the automobile crane 13 and the pile pulling machine 12 are positioned at the top of the slope, the vibration hammer 15 is connected to the pile pulling machine 12 through the lengthened hydraulic oil pump pipe 14, the pile pulling machine 12 controls the vibration hammer 15 to vibrate continuously through the hydraulic oil pump pipe 14, the automobile crane 13 lifts the steel wire rope hook to hang the vibration hammer 15, the vibration hammer 15 clamps the pile head of the steel sheet pile 1, and is ready for positioning;
[0026] ② Personnel in place: at least one pit top commander sends instructions and signals, one crane driver and one pile pulling machine 12 driver control the crane and pile pulling machine 12 machinery, at least one cable installer cooperates to install the crane hook, and at least two workers cooperate to move the vibration hammer 15 at the bottom of the pit and transport the removed steel sheet pile 1, and timely backfill the steel sheet pile 1 pile hole;
[0027] ③ Remove the steel sheet pile 1: the crane hook hangs the hydraulic vibration pile hammer, which is slowly sent to the position of the steel sheet pile 1 at the bottom of the foundation pit, and the hammer head clamps the head of the steel sheet pile 1. After the workers are in place, listen to the commander's signal and move away from the pit bottom. First, start the pile pulling machine 12, transfer the excitation force to the hydraulic vibration pile hammer through the lengthened hydraulic high-pressure oil pipe, clamp the head of the steel sheet pile 1 with the hammer head, and vibrate for 1-2 minutes. After the pile head is loosened, the crane starts to slowly pull up the hook, so that the steel sheet pile 1 is gradually pulled up;
[0028] ④ Steel sheet pile 1 soil hole treatment: after the steel sheet pile 1 is pulled out, the pile hole left after the pile is pulled out is backfilled, the remaining space after backfilling should be filled with 1:1 cement slurry or medium-coarse sand as soon as possible, and the pile pulling is completed. After repairing the hole, the steel sheet pile 1 needs to be checked comprehensively to ensure that there is no damage or defect. Evaluate the entire pile pulling process, record data and observed phenomena, analyze and summarize, provide experience and lessons for subsequent operations. Finally, the recovered steel sheet pile 1 is transported to the designated location and properly handled to ensure effective use of resources. The removal process of the steel sheet pile 1 is summarized, deficiencies are found and improved to further improve work efficiency and quality.
[0029] The above examples are only used to illustrate but not to limit the technical solutions of the present application. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the present application can still be modified or equivalently replaced without departing from the spirit and scope of the present application, and any modification or partial replacement should be covered in the scope of the claims of the present application.
Claims
1. A deep foundation pit large batter slope toe steel sheet pile support structure, characterized in that: The utility model provides a kind of steel sheet pile foundation, including several steel sheet piles arranged vertically downward on foundation pit slope, several steel sheet piles are arranged side by side in front and back, the upper end of steel sheet pile is projected from foundation pit slope, the right side of steel sheet pile is provided with foundation slab, the lower part of foundation slab is provided with bearing platform, the bottom of bearing platform is provided with first cushion layer, first cushion layer is arranged in foundation pit bottom, the top of foundation slab is provided with waterproof protective layer, the upper end of foundation slab is connected with basement outer wall, waterproof protective layer is arranged on the left side of basement outer wall, backfilling stone powder area and bottom plate brick membrane are arranged between the left end of foundation slab and the right side of steel sheet pile, backfilling soil area and first bearing platform brick membrane are arranged between the left end of bearing platform and steel sheet pile.
2. The deep foundation large batter footing steel sheet pile support structure according to claim 1, characterized in that: The gap between backfilling soil area and backfilling stone powder area is filled with second cushion layer, and the right end of the bearing platform is provided with a second bearing platform brick membrane.
3. The deep foundation large batter footing steel sheet pile support structure according to claim 2, characterized in that: A water-stopping steel plate is arranged in the basement outer wall.
4. The deep foundation large batter footing steel sheet pile support structure according to claim 3, characterized in that: The upper end of the backfilling stone powder area is provided with a concrete coping layer.
5. The deep foundation large batter footing steel sheet pile support structure according to claim 4, characterized in that: The backfilling stone powder area is located to the left of the bottom plate brick membrane, which is arranged on the left end face of the foundation slab.
6. The deep foundation large batter footing steel sheet pile support structure according to claim 5, characterized in that: The backfilling soil area is located to the left of the bearing platform brick membrane, which is arranged on the left end of the bearing platform.